Dual-purpose presser foot device

Abstract

The utility model relates to the technical field of sewing machine presser feet, in particular to a dual-purpose presser foot device. And one mechanism can realize different follow-up modes, so that customers can select conveniently. According to the technical scheme, the device comprises an upper shaft, the upper shaft is fixedly connected with an eccentric cam assembly, a crank A is arranged on a swing shaft, and the other end of the eccentric cam assembly is connected into a sliding groove of the crank A through a pin and can slide in the sliding groove; a connecting rod B is hinged to one end of the swing shaft, an L plate is hinged to the other end of the connecting rod B, the other end of the L plate is hinged to one end of a connecting rod C, the other end of the connecting rod C is hinged to a pressing rod connector, the pressing rod connector is fixedly connected with the pressing foot through a pressing rod, and the rotating shaft position of the L plate is hinged to the lifting and pressing crank. A crank B is fixedly connected to a shaft of the presser foot motor, the other end of the crank B is hinged to one end of a connecting rod A, the other end of the connecting rod A is hinged to a lifting and pressing crank, and the lifting and pressing crank is hinged to a pin.

Description

Technical Field

[0001] The utility model relates to the technical field of sewing machine presser feet, and particularly relates to a dual-purpose presser foot device. Background Art

[0002] At present, the follower presser foot devices on the market are divided into two types: mechanical follower and motor follower; and the presser foot lifting mechanisms include motor presser foot lifting, electromagnet presser foot lifting, cylinder presser foot lifting, etc., and generally manufacturers will choose one to use.

[0003] The following time of the mechanical follower presser foot is stable and reliable, suitable for high-speed sewing, but the adjustment of the following amount and the following time needs to be achieved by adjusting the mechanical structure, which generally takes a long time to adjust, and because the presser foot lifting is driven by a separate set of structure, the structure is complex.

[0004] Since the motor presser foot is driven by a motor, the following and lifting of the presser foot can be achieved by motor drive, and the following time and the height of the presser foot lifting can be electronically adjusted, which is simple and convenient. However, the motor follower presser foot is affected by various factors during high-speed sewing, there is a hidden danger of untimely following, and affected by factors such as installation space and cost, usually the pressure of the motor presser foot is not as large as that of the mechanical presser foot.

[0005] The existing presser foot devices can only find different follower presser foot devices according to needs, with great limitations. Content of the Utility Model

[0006] In view of this, the utility model provides a dual-purpose presser foot device, which can achieve different following methods with one mechanism, facilitating the customer's choice.

[0007] To solve the problems existing in the prior art, the technical solution of the utility model is: a dual-purpose presser foot device, characterized in that: it includes an upper shaft, a swing shaft, a presser foot motor, a pressing rod joint, and a presser foot;

[0008] An eccentric cam assembly is fixedly connected to the upper shaft, a crank A is arranged on the swing shaft, the other end of the eccentric cam assembly is connected to the chute of the crank A through a pin and can slide in the chute; one end of the swing shaft is connected with a link B hinged, the other end of the link B is hinged with an L-shaped plate, the other end of the L-shaped plate is hinged to one end of a link C, the other end of the link C is hinged to the pressing rod joint, the pressing rod joint is fixedly connected with the presser foot through a pressing rod, and the rotating shaft position of the L-shaped plate is hinged to a lifting crank;

[0009] A crank B is fixedly connected to the shaft of the presser foot motor, the other end of the crank B is hinged to one end of a link A, the other end of the link A is hinged to the lifting crank, and the lifting crank is hinged to a pin.

[0010] Furthermore, the eccentric cam assembly includes an eccentric cam, a bearing, and a cam connecting rod. The bearing is sleeved on one side of the eccentric cam, and the cam connecting rod is sleeved on the circumference of the bearing.

[0011] Furthermore, a roller is sleeved in the hole at the other end of the cam connecting rod. A pin passes through the roller, and the other end is locked at any position of the chute of crank A through a nut, for adjusting the swing range of the swing shaft.

[0012] Furthermore, crank A is fixedly connected to the swing shaft through a locking screw.

[0013] Furthermore, a presser foot motor mounting plate is connected to the presser foot motor, and the presser foot motor is fixedly connected to the machine housing through the presser foot motor mounting plate.

[0014] Furthermore, a retaining plate is provided on the side of the eccentric cam where the bearing is installed to prevent the cam connecting rod from disengaging.

[0015] Furthermore, gaskets are respectively arranged on both sides of the hole at the other end of the cam connecting rod to prevent the roller from moving left and right.

[0016] Furthermore, the pin is fixedly connected to the machine housing.

[0017] Compared with the prior art, the advantages of the present utility model are as follows:

[0018] 1. The present utility model can realize two forms of presser foot follow-up, solve the defects of the two follow-up forms, and can select mechanical follow-up presser foot or motor follow-up presser foot on the operation screen according to requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic diagram of the transmission structure of the present utility model;

[0020] Figure 2 is a schematic diagram of the eccentric cam adjustment mechanism of the present utility model;

[0021] Figure 3 is an installation schematic diagram of the present utility model;

[0022] Description of the reference numerals: 1: upper shaft; 2: eccentric cam assembly; 3: swing shaft; 4: pin; 5: crank A; 6: presser foot motor; 7: presser foot motor mounting plate; 8: crank B; 9: connecting rod A; 10: lift presser foot crank; 11: pin; 12: connecting rod B; 13: L plate; 14: connecting rod C; 15: clamping rod joint; 16: clamping rod; 17: presser foot; 18: roller; 19: gasket; 20: nut; 21: locking screw;

[0023] 2-1: eccentric cam; 2-2: bearing; 2-3: cam connecting rod; 2-4: retaining plate; a: machine housing; DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] In the description of the present invention, it should be noted that, unless otherwise clearly defined and limited, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific situations.

[0025] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts belong to the scope of protection of the present invention.

[0026] A dual-purpose presser foot device, as Figure 1 and 2 shown, includes an upper shaft 1, a swing shaft 3, a presser foot motor 6, a crank B8, a connecting rod A9, a lift presser foot crank 10, a connecting rod B12, an L-shaped plate 13, a connecting rod C14, a presser bar joint 15, a presser bar 16, and a presser foot 17; an eccentric cam assembly 2 is fixedly connected to the upper shaft 1, a crank A5 is provided on the swing shaft 3, the other end of the eccentric cam assembly 2 is connected to the chute of the crank A5 through a pin 4 and can slide in the chute; one end of the swing shaft 3 is connected with a connecting rod B12 hinged, the other end of the connecting rod B12 is hinged with an L-shaped plate 13, the other end of the L-shaped plate 13 is hinged to one end of the connecting rod C14, the other end of the connecting rod C14 is hinged to the presser bar joint 15, the presser bar joint 15 is fixedly connected to the presser foot 17 through the presser bar 16, and the rotating shaft position of the L-shaped plate 13 is hinged to the lift presser crank 10; a crank B8 is fixedly connected to the shaft of the presser foot motor 6, the other end of the crank B8 is hinged to one end of the connecting rod A9, the other end of the connecting rod A9 is hinged to the lift presser crank 10, and the lift presser crank 10 is hinged to the pin 11.

[0027] As an implementation manner in this embodiment, the eccentric cam assembly 2 includes an eccentric cam 2-1, a bearing 2-2 is sleeved on the eccentric cam 2-1, a cam connecting rod 2-3 is sleeved on the bearing 2-2, a retaining piece 2-4 is provided at the other end of the eccentric cam 2-1 to prevent the cam connecting rod 2-3 from coming out, and gaskets 19 are respectively arranged on both sides of the hole at the other end of the cam connecting rod 2-3 to prevent the roller 18 from moving left and right.

[0028] As an implementation manner in this embodiment, a roller 18 is sleeved in the hole at the other end of the cam connecting rod 2-3, the pin 4 passes through the roller 18, and the other end is locked at any position of the chute of the crank A5 through a nut 20 for adjusting the swing range of the swing shaft 3;

[0029] As an implementation mode in this embodiment, the crank A5 is fixedly connected to the swing shaft 3 through the locking screw 21.

[0030] As an implementation mode in this embodiment, a presser foot motor mounting plate 7 is connected to the presser foot motor 6, and the presser foot motor 6 is fixedly connected to the machine housing a through the presser foot motor mounting plate 7; the pin 11 is fixedly connected to the machine housing a, as Figure 3 shown.

[0031] The working process of the utility model:

[0032] The utility model provides a dual-purpose presser foot device. When using a mechanical follower presser foot, the presser foot motor 6 remains stationary during sewing, so that the lifting presser foot crank 10 remains stationary, providing a fixed rotation center for the L plate 13. When the upper shaft 1 rotates, the eccentric cam assembly 2 will push the crank A5, and then the swing shaft 3 will swing. The swing shaft 3 drives the L plate 13 to rotate around the hinge point with the lifting presser foot crank 10 through the connecting rod B12, thereby driving the pressing rod connecting rod 15 connected to the connecting rod C14 to move up and down. The pressing rod connecting rod 15 is fixedly connected to the pressing rod 16, and the pressing rod 16 is fixedly connected to the presser foot 17, so the presser foot 17 can move up and down. When sewing is completed, the upper shaft 1 stops rotating, and then the swing shaft 3 is fixed. The presser foot motor 6 rotates clockwise, driving the crank B8 fixedly connected to the motor shaft to rotate, pulling the lifting presser foot crank 10 to rotate counterclockwise around the pin 11 through the connecting rod A9, and then driving the L plate 13 to move in an arc. The connecting rod B12 moves in an arc around the hinge point with the swing shaft 3, thereby pulling the connecting rod C14 and driving the presser foot 17 to move upward, playing the role of lifting the presser foot. When sewing is required, the presser foot motor 6 rotates counterclockwise, and the presser foot drops.

[0033] When choosing to use the motor presser foot follower, disconnect the fixed connection between the crank A5 and the swing shaft 3, loosen the locking screw 21 of the crank A5, and use the locking screw 21 to tighten the swing shaft 3. The presser foot motor 6 reciprocates at a small angle to achieve the follow-up of the presser foot 17. When it is necessary to lift the presser foot 17 at the end of sewing, the presser foot motor 6 rotates at a large angle.

[0034] During the use of the utility model, only need to loosen the locking screw of one transmission mechanism and tighten the locking screw of the other transmission mechanism to achieve quick switching.

[0035] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A dual-purpose presser foot device, characterized in that: It includes an upper shaft (1), a swing shaft (3), a presser foot motor (6), a presser bar joint (15), and a presser foot (17); The upper shaft (1) is fixedly connected with an eccentric cam assembly (2). A crank A (5) is arranged on the swing shaft (3). The other end of the eccentric cam assembly (2) is connected to the chute of the crank A (5) through a pin (4) and can slide in the chute. One end of the swing shaft (3) is hinged with a connecting rod B (12). The other end of the connecting rod B (12) is hinged with an L-shaped plate (13). The other end of the L-shaped plate (13) is hinged with one end of a connecting rod C (14). The other end of the connecting rod C (14) is hinged on the presser bar joint (15). The presser bar joint (15) is fixedly connected with the presser foot (17) through a presser bar (16). The rotating shaft position of the L-shaped plate (13) is hinged on a lift presser crank (10); A crank B (8) is fixedly connected to the shaft of the presser foot motor (6). The other end of the crank B (8) is hinged with one end of a connecting rod A (9). The other end of the connecting rod A (9) is hinged on the lift presser crank (10). The lift presser crank (10) is hinged on a pin (11).

2. The dual-purpose presser foot device according to claim 1, characterized in that: The eccentric cam assembly (2) includes an eccentric cam (2-1), a bearing (2-2), and a cam connecting rod (2-3). The bearing (2-2) is sleeved on one side of the eccentric cam (2-1). The cam connecting rod (2-3) is sleeved on the circumference of the bearing (2-2).

3. The dual-purpose presser foot device according to claim 2, wherein: A roller (18) is sleeved in the hole at the other end of the cam connecting rod (2-3). The pin (4) passes through the roller (18), and the other end is locked at any position of the chute of the crank A (5) through a nut (20) for adjusting the swing range of the swing shaft (3).

4. A dual-purpose presser foot device according to claim 2 or 3, characterized in that: The crank A (5) is fixedly connected to the swing shaft (3) through a locking screw (21).

5. The dual-purpose presser foot device according to claim 4, characterized in that: A presser foot motor mounting plate (7) is connected to the presser foot motor (6). The presser foot motor (6) is fixedly connected to the machine housing (a) through the presser foot motor mounting plate (7).

6. The dual-purpose presser foot device according to claim 2, characterized in that: A retaining piece (2-4) is arranged on the side of the eccentric cam (2-1) where the bearing is installed to prevent the cam connecting rod (2-3) from coming out.

7. The dual-purpose presser foot device according to claim 6, characterized in that: Gaskets (19) are respectively arranged on both sides of the hole at the other end of the cam connecting rod (2-3) to prevent the roller (18) from moving left and right.

8. The dual-purpose presser foot device according to claim 7, wherein: The pin (11) is fixedly connected to the machine housing (a).

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